One thing that hasn't been mentioned here, I don't think, is that Nikon in the past two or so years came out with their big guns totally redone with VR, the 400 f2.8, 500 and 600 f4. While these lenses are as expensive as a used car, they are absolutely amazing quality. All one need do is hold them in comparison to their Canon counterparts to see the incredible quality, from the bags they come with to the carbon fiber hoods, etc.
And let's not lightly dismiss the 200-400. It's an absolutely incredible offering in spite of its price.
Before the recent spate of price increases, the Canon 200 f2 was over a thousand dollars more expensive than the Nikon f2.
I completely agree about Nikon's lack of f4 glass. I prefer f2.8, however, so it doesn't really matter to me.
As to IQ of the 70-200, with the exception of the edges of the frame, which I don't discount the importance of, the lenses are equal. If one uses the Nikon version on a crop format, it's an amazing lens.
The new Nikon 24-70 is superior to the Brick in many ways, IQ, weight, build quality, etc. Neither have IS nor need it.
Please don't mention the 17-40 or 16-35 in the same sentence as the 14-24. The 14-24 is probably the best wide angle zoom ever produced, period, end of story.
Is the Nikon offerings in some instances obscenely expensive? Yep. But if you can't pay, don't play. Price don't bother me; never has, never will.
I was originally a Canon shooter with the AE-1 Program, switched to the D100, then back to Canon with the 10D, 20D, 1DsMKII, 1DMKIII, 1DsMKIII.
Dumped them all when I realized how much more accurate and consistent the D3's focus is.
And let's not forget the far superior flash system of Nikon. That's an established fact. And their new SB900, with it's variability from wide to normal to narrow beam, and it's zoom range, is unmatched by any current Canon offering.
me